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1 /*
2 * Key-agreement Protocol Primitives (KPP)
3 *
4 * Copyright (c) 2016, Intel Corporation
5 * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 */
13 #include <linux/errno.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/seq_file.h>
17 #include <linux/slab.h>
18 #include <linux/string.h>
19 #include <linux/crypto.h>
20 #include <crypto/algapi.h>
21 #include <linux/cryptouser.h>
22 #include <net/netlink.h>
23 #include <crypto/kpp.h>
24 #include <crypto/internal/kpp.h>
25 #include "internal.h"
26
27 #ifdef CONFIG_NET
28 static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
29 {
30 struct crypto_report_kpp rkpp;
31
32 strncpy(rkpp.type, "kpp", sizeof(rkpp.type));
33
34 if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
35 sizeof(struct crypto_report_kpp), &rkpp))
36 goto nla_put_failure;
37 return 0;
38
39 nla_put_failure:
40 return -EMSGSIZE;
41 }
42 #else
43 static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
44 {
45 return -ENOSYS;
46 }
47 #endif
48
49 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
50 __attribute__ ((unused));
51
52 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
53 {
54 seq_puts(m, "type : kpp\n");
55 }
56
57 static void crypto_kpp_exit_tfm(struct crypto_tfm *tfm)
58 {
59 struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
60 struct kpp_alg *alg = crypto_kpp_alg(kpp);
61
62 alg->exit(kpp);
63 }
64
65 static int crypto_kpp_init_tfm(struct crypto_tfm *tfm)
66 {
67 struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
68 struct kpp_alg *alg = crypto_kpp_alg(kpp);
69
70 if (alg->exit)
71 kpp->base.exit = crypto_kpp_exit_tfm;
72
73 if (alg->init)
74 return alg->init(kpp);
75
76 return 0;
77 }
78
79 static const struct crypto_type crypto_kpp_type = {
80 .extsize = crypto_alg_extsize,
81 .init_tfm = crypto_kpp_init_tfm,
82 #ifdef CONFIG_PROC_FS
83 .show = crypto_kpp_show,
84 #endif
85 .report = crypto_kpp_report,
86 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
87 .maskset = CRYPTO_ALG_TYPE_MASK,
88 .type = CRYPTO_ALG_TYPE_KPP,
89 .tfmsize = offsetof(struct crypto_kpp, base),
90 };
91
92 struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask)
93 {
94 return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask);
95 }
96 EXPORT_SYMBOL_GPL(crypto_alloc_kpp);
97
98 static void kpp_prepare_alg(struct kpp_alg *alg)
99 {
100 struct crypto_alg *base = &alg->base;
101
102 base->cra_type = &crypto_kpp_type;
103 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
104 base->cra_flags |= CRYPTO_ALG_TYPE_KPP;
105 }
106
107 int crypto_register_kpp(struct kpp_alg *alg)
108 {
109 struct crypto_alg *base = &alg->base;
110
111 kpp_prepare_alg(alg);
112 return crypto_register_alg(base);
113 }
114 EXPORT_SYMBOL_GPL(crypto_register_kpp);
115
116 void crypto_unregister_kpp(struct kpp_alg *alg)
117 {
118 crypto_unregister_alg(&alg->base);
119 }
120 EXPORT_SYMBOL_GPL(crypto_unregister_kpp);
121
122 MODULE_LICENSE("GPL");
123 MODULE_DESCRIPTION("Key-agreement Protocol Primitives");